Abstract
We extract the Boer-Mulders functions of valence and sea quarks in the proton from unpolarized $p+D$ Drell-Yan data measured by the FNAL E866 Collaboration. Using these Boer-Mulders functions, we calculate the $\mathrm{cos}2\ensuremath{\phi}$ asymmetries in unpolarized $pp$ Drell-Yan processes, both for the FNAL E866/NuSea and the BNL Relativistic Heavy Ion Collider experiments. We also estimate the $\mathrm{cos}2\ensuremath{\phi}$ asymmetries in the unpolarized $p\overline{p}$ Drell-Yan processes at GSI.
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